I am new here but am very interested in this update you describe esp >...the German Trains..
I am a long time modder and researcher of Train sims and esp German trains and would be very interested to see these and happy to help with any additional information or resources you may need....thanks so much for taking the time for this. If you are placing the models into France as I suspect you are, much of the equipment was French, and that is a particular area of interest and again expertise of mine if I can help ..and I have contacts in the French train sim world and we may indeed be able to get you permission to convert existing train models from 3D formats used in MS Train sim. Just wanted to offer aide on this little corner of things, I am still just new here and learning the ropes but would be happy to help if i can.
L'Etoile De Gray - a great MSTS route from France in 1938 some of the common French equipment...